Best way is to wire the pump with the OEM 7M harness but u will be good to wire it tru a relay as long as your return line/fuel system is in tip top shape, so the fuel system dont overheat or get messed up by pump overheat, as i told you before by PM!

make sure if you wire it independently that you use one of the electronic fuel cutout relays or use an oil pressure safety switch, this stops the pump if the engine is stopped, EG. You just hit some idiot texting on the cell phone head on, it stops your car from becoming a flaming coffin. Lots of older Honda stuff has the ignition sensing module, it senses pulses from the negative side of the coil and allows the relay to turn on the pump, they are a simple ignition power,ground, sense wire to coil, and 12 volts out to pump relay, don't skip this stuff, in a setup where the ecu controls the pump, the ECU does the same thing. The oil pressure safety switch only allows current to flow when there is engine oil pressure, engine stops, switch turns off pump relay

just because some cars have the ECU in the engine compartment doesn't mean all ECU's are meant to be mounted this way, it's an awful place to put it and bad design, most Chrysler stuff will eventually fail anyway so it doesn't make any difference